Key telephone monobus conference arrangement

Details Key telephone monobus conference arrangement Key telephone monobus conference arrangement

1975-05-23

1976-11-09

Claffy, Kathleen H.

179 1CN, H04M 356

Patent

active

039912817

ABSTRACT:
A monobus conference arrangement is disclosed for use in a key telephone system. A conference circuit is serially inserted on each line and is arranged with an impedance element common to all of the stations using the line. In addition, a monobus circuit replaces the conventional hybrid in each station set. To avoid the problem of having more than one such impedance element connected in a multiline conference, the system is arranged so that current flows in a first direction through the conference circuit associated with the first-connected line and in a reverse direction through subsequently connected line conference circuits. Under control of the reverse current flow, the common impedance elements associated with the reverse current line conference circuits are removed from the connection.

REFERENCES:
patent: 3534175 (1970-10-01), Schultz
patent: 3668289 (1972-06-01), Fenton
patent: 3818139 (1974-06-01), Snyder
patent: 3828146 (1974-08-01), Lewis
patent: 3909559 (1975-09-01), Taylor

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